It's the same series of argument thrown at any of these changes (we had the same word-for-word when we had a home zone in Ealing in the early 2000s to the implementation of a 20 mph zone in Croydon in the later 2010s). They don't care about any of it. It's the old joke, how do you get a driver to care about pollution? Tell him he's going to have slow down.
I can't do Nextdoor, I glanced a while ago, and indeed, full of people griping about getting an FNP for driving down a street in Croydon. Now I don't even drive in Croydon and even I'm aware you can't drive down that street anymore, plus when I clicked a link to a photo of a nutcase standing up with a protest sign at the end of them street, behind him, on poles two huge 'road closed to traffic'-style signs clearly indicating that, no, driving any further will incur financial penalty. Ironically, the protest sign was illegible.
As with all change, if those same people didn't whine, it wouldn't be change.